Dust-cap for tire-valves and the like



H. P. KRAFT.

DUST CAP FOR TIRE VALVES AND THE LIKE.

APPLICATION FILEDv DEC. 17, I914.

Patented Dec. 27, 1921.

2 SHEETS-SHEET 1- INVENTOR M I By Attorneys,

WITNESSES:

H. P. KRAFT. DUST CAP FOR TIRE VALVES AND THE LIKE.

APPLICATION FILED DEC. HI 1914..

Patented Dec. 27, 1921.

FigiB Fig- 7 Fig.8

INVENT'OR 1 4 2w. Z By Attorney WITNESSES:

UNITED STATES HENRY PHILLIP KBAF'F, OF RIDGEWOOD, NEW JERSEY.

d To allwhom it may concern:

Be it known that *I, HENRY PHILLIP KRAFT, a citizenof the United States of America, residing at Ridgewood, in the county of Bergen and State of New ersey, U. S. A., have invented certain new and useful Improvements in Dust-Caps for Tire-Valves and the like, of which the following is a specification.

This invention relates to dust caps for tire and other valves,and aims to provide certain improvements therein. The com- T mechanism is usually located wholly within mongform of tire valve comprises a casing T T extending through the felly of the wheel less egree, dependin and 1 rojecting inwardly to a greater or on thethickness' of the felly with which it is used. The valve the casing, and the outer end of the casing is provided with a valve cap which is customarily formedwith a central projection designed to engage the valve mechanism for the purpose of removing it from the T T casing or restoring it therein. It is also T 25 customary to provide a dust cap which screws over theprojecting art of the valve casing for the purpose 0 excluding dust and moisture, and protecting the casing. Such caps are customarily made of a length sufiicient to inclose the projecting end of the valve casing withtheordinary fellies emplayed, but if the felly is much reduced in thickness, the correspondingly large art of the casing projects, and it occasional y happensthat the closed end of the dust cap will engage the valve cap before the dust cap is seatedagainst the folly. Under these circumstances the dust cap is apt to become erforated,fand thevalvecap is apt to be injured. p d d d According to thepresent invention, Iprovide a dust cap having a means forpreventing it from being screwed past the danger point, so that neither the dust ca) nor the valve cap can be injured. Sue means preferably comprise engaging portions on. the dust can and valve, andby preference the dust cap is formed with a T shoulder which engages the body of the valve cap in such manner that the projection on the valve cap is prevented from contacting with the dust cap. The invention also includes certain other] features of improvement which will be hereinafter pointed out. T

Referring the drawings which illus-wing a shoulder such as Specification of Letters Patent.

N nUs'r-oer FOR TIRE-VALVES AND THE LIKE.

Patented Dec. 2'2, 1921.

Application filed December 17, 1914. Serial No. 877,789.

ca d T Fig. 3 is a sectional view of the dust cap on a larger scale.

Fig. 41s a sectional view of the adjusting collar shown in Figs. 1 and 2.

Fig. 5 is an elevation of a part of the valve casing and felly showing a slightly different form of cap.

Fi anotiier modification. F g. 7 is a sectional view of Fi 6.

Fig. 8 IS a view partly in elevation ofthe dust cap of Fig. 7

Fig. 9 is a view of another, modification. Referring to the. drawings, let A indicate a wheel :Ee y of common construction, and B a form of metal rim adapted to engage the tire. C indicates the common form of pneumatic tire valve which is screw-threaded throughout its length and is some times provided with a rim nut D adapted to clamp the valve casing in place. By reference to Fig. 2 it will be seen that the valve casing is usually reduced in diameter at its outer end, asindicated at E, the reduced portion or nipple being also screw-threaded to receive the valve .ca F. customarily forms with a central reduced projection G fprovided with screw driver notches Hadapted to be inserted in the valve casing for the purpose of unscrewing the valve mechanism (not shown) or screwing it into place. T

According to thepresent invention, I provide an improved dust cap J which adapted to screw over the projecting end of the valve casing and prevent to a large extent the entrance of dust and moisture upon and around the valve cap F, so that this portion is protected from accidental injury. The

invention provides a construction in which the dust cap and valve casin are provided with interengaging means which will limit the screwing-on movement of the dust cap in such a manner as to avoid contacting the rojection G with the end of the dust cap. his is preferably accomlplished .byformon the interior 6 is a view similar to Fig. 1 showing The valve cap of the dust cap, which is adapted to contact with the body portion L of the valve cap, the shoulder beingso located that it engages the body'portion before the projection G can engage the end'of the cap. Such engagement is not injurious to the dust cap or valve cap, since thersho ulder of the dust 7' cap and body portion of the valve cap are sufficiently strong and large to avoid any damage. At the, same (time any strain or wear is removed from the screw driver end of the valve cap.

The dust cap may screw directly upon the valve c'asing,mas illustrated inFig. 5, and

this construction may be followed where a dust cap lsconstructed for a certain size of valve casing. Suchcasings however, are manufactured in d fferent s1zes,.and the 1nvention provides a means for permitting the use of one size of dust cap upon such different iSiZGS of valve casings. .In Fig. 2

V such means are illustrated as an adjusting sleeve M which is interiorly threaded, and

which is adapted to screw upon the valve casing. Preferably, the sleeve M is formed 'with an internalshoulder N which is adapted to engage the'shoulder O on the valve it is preferable to form it with a reduced outer end It sufiicient in diameter however, to easlly pass overv the pro ection G of the valve cap.

In Figs. 6 to 8 the dust cap is shown as elongated and as applied to a valve which projects very slightly form the telly. If the valve is small, the adjusting sleeve M may be employed, as in Figs. 1 and 2.

I1": desired, the cap. and sleeve M may be formed in one piece, a shown in Fig. 9, in which case the shoulder N is adapted to engage the shoulder O and constitute a means for stopping the onward movement of the dust cap.

In the use of dust caps, particularly when they may be covered with oil or moisture, it is some times diflicult to screw and unscrew them. To facilitate these operations I provide-a cap in which are formed a series of'ribs S-" When the dust cap is construct "ed of sheet metal, these ribs are drawn in the sides thereof and constitute a very effective hand hold for the cap, being superior to the ordinary 'knur-ling commonly employed. Preferably, the ribs extend over a large portion of the body of the cap so as to increase the efiectivegijrppin surface. These ribs also act to reinforce the body of the dust cap, which reinforcement is of special importance in dust caps made from sheet metal.

While I have shown and described several embodiments of the invention, it is understood that I do not wish to be limited thereto, a various changes may be made there in without departing from the invention.

What I claim is:

1. The combination of a valve casing having a nipple and a dust cap adapted to pass freely over said nipple, said dust cap and valve casing having an engaging means for holding the cap in place on the valve casing, said dust cap and valve casing having abutting means at the inlet end of the casing for preventing the onward movement of the cap beyond a fixed point prior to the cap reaching the limit of movement otherwise permitted by the engaging means, the engaging means on the casing otherwise permitting further movement of the cap.

2. The combination of a valve casing having a nipple and a dust cap adapted to pass freely over said nipple, said dust cap and valve casing having an engaging means for holding the cap in place on the valve casing, said dust cap and valve casing having abutting means at the inlet end of the casing for preventing the onward movement of the cap beyond a fixed point prior to the cap reaching the limit of movement otherwise permitted by the engaging means, the engaging means on the casing otherwise permitting further movement of the cap, said means comprising a part on the valve casing, and a part'on the dust cap.

3. A dust cap having means at its open end adapted to hold it in place on a valve casing and having its closed end adapted to freely inclose the valve nipple, and said dust cap having an internal shoulder adapted to engage a shoulder on the'valve casing to limit the onward movement of the cap.

4. A dust cap having means at its open end adapted to hold it in place on a valve casing and having its closed end adapted to freely inclose the valve nipple, and said dust cap having an internal shoulder adapted to en gage the body of a valve cap to limit the onward movement of the cap.

5. A dust cap having a screw-threaded portion at its inner end for engagement with a valve casing or the like and an internal shoulder at its outer end to engage a shoulder on a part connected with the casing to limit the onward movement of the dust cap.

6. A dust cap having a sleeve adapted to screw on a valve casing, said sleeve having 'means for engaging the casing to limit its onward movement.

:7. A dust cap having a removable sleeve, said sleeve having means for engaging a valve casing to limit its onward movement.

and a sleeve engaging said screw-t or the like formed of rigid material 8. A dust cap having a screw-threaded portion, a sleeve adapted to engage said screw-threaded portion, said sleeve having a threaded portion to screw on a tire valve, and having means for engaging the tire valve to limit its onward movement. 9. A dust cap having an internal shoulder adapted to contact with the body of a valve cap and having a screw-threaded ortion, iireaded portion and adapted to screw on a tire valve:

10. A dust cap having an internal shoulder adapted to contact with the body of a valve cap and having a screw-threaded portion, and a sleeve engaging said screw-- threaded portion and adapted to screw on a tire valve, said sleeve having an internal shoulder adapted to engage the tire valve to limit its onward movement. a 11. A sheet metal dust cap for tire valves ,having a series of ribs formed )y bending its body portion. 1

12. A dust cap formed of rigid material having a body portion having an internal diameter sufficient to fit over a valve casin and having a contracted inner end forme" with an internal screw-thread, and having a portion of reduced diameter projecting from its outer end. adapted to freely inclose the projecting portion of avalve cap.

13. A sheet metal dust cap having a body portion of sufficient diameter to fit over a valve casing and havin its lower end contracted and formed wit an internal screwthread and having its outer end formed with a contracted drawn metal portion adapted to fit over and inclose the projecting portion of a valve cap.

14. A dust cap formed of sheet metal and having a screw-threaded inner end and a projecting portion of reduced diameter at its outer end adapted to slip over and inclose the projecting portion of a valve cap, and the metal between said reduced portion and the body of said ,cap constituting a shoulder adapted to engage the body of a valve cap to limit the onward movement of the dust cap.

and having a series of ribs on its exterior at a portion other than the portion provided with said engaging means. I

16. A dust cap for tlre valves or the like formed of ri id material and having a portion rovide with screw-threads whereby it may e fastened over a tire valve casing, and another portion having its interior spaced tion provided with screw-threads whereby itmaybe fastened over a tire valve casing, and another portion having its interior spaced from the valve casing over which it is to be fitted and its exterior provided with a series of ribs in the form of bends in the material of which the cap is formed.

18. A dust cap for tire valves or the like formed of rigid sheet material and having a portion provided with engaging means for fastening the cap in position over a tire valve casing, and having another portion having its interior spaced from the valve casing over which it is to be fitted and having ribs in the form of bends in the material of which the cap is formed, adapted to reinforce said cap.

19. A dust cap for tire valves or the like formed of rigid sheet material and having a portion provided with engaging means for fastening the cap in position over a tire valve casing, and having another portion having its interior spaced from the valve casing over which it is to be fitted and having ribs in the form of bends in the material of which the cap is formed, adapted to reinforce said cap, and to serve for facilitating the grasp of the fingers of a manipulator in forcing said cap into and out of engaging position.

20. In combination, a valve casing having external screw threads substantially. the

length thereof, and a reduced nipple in its inlet end, a dust cap adapted to pass freely over said nipple, and having an internal di ameter greater than that of said casing, and an intermediate part between said cap and casing, and means for preventing onward movement of said cap beyond a fixed point.

21. In combination, a valve casing having external screw threads substantially the length thereof, and a reduced nipple in its inlet end, a dust cap adapted to pass freely over said nipple, and having an internal diameter greater than that of said casing, and an intermediate part between said cap and casing, and means for preventing onward movement of said cap beyond a point which would allow contact to be made between the top of the cap and the end of the casing.

In witness whereof, I have hereunto signed my name in the presence of two subscribing witnesses.

HENRY PHILLIP KRAFT.

Witnesses E. G. MYERS, FRED WHITE. 

